CN204421987U - One is dripped measurement mechanism - Google Patents
One is dripped measurement mechanism Download PDFInfo
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- CN204421987U CN204421987U CN201520077936.4U CN201520077936U CN204421987U CN 204421987 U CN204421987 U CN 204421987U CN 201520077936 U CN201520077936 U CN 201520077936U CN 204421987 U CN204421987 U CN 204421987U
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- sensitive resistor
- temperature sensor
- measurement mechanism
- resistance
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- 238000005259 measurement Methods 0.000 title claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 89
- 239000003990 capacitor Substances 0.000 claims description 25
- 238000005538 encapsulation Methods 0.000 claims description 3
- 230000002706 hydrostatic effect Effects 0.000 abstract description 6
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 2
- 239000010935 stainless steel Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 229910052742 iron Inorganic materials 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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Abstract
The utility model proposes one to drip measurement mechanism, comprising: the first temperature sensor and the second temperature sensor; First temperature sensor is arranged on airtight circuit board, second temperature sensor is arranged on inside water meter inlet segment to water exit end, first temperature sensor output signal and the second temperature sensor output signal carry out subtraction, the voltage difference obtained is corresponding with flow rate of water flow, and the timing signal of timer is multiplied with described voltage difference and draws drip metering value.Hydrostatic temperature after the utility model balance and the changing value of flowing water temperature dripped, and environment temperature reference point just accurately can judge dripping phenomenon, and the size of dripping is directly proportional to the absolute value of temperature gap, when difference arrives greatly a certain value, water meter turbine rotates, and the measurement mechanism that drips can stop drip metering, during miniflow, can measure, and when flow is large, be converted to the mechanical type metering of wing type meter; Because temperature sensor is sealed by stainless-steel tube, so long service life.
Description
Technical field
The utility model relates to field of measuring techniques, and particularly one is dripped measurement mechanism.
Background technology
Water meter is a kind of metering outfit, and for measuring the water consumption of water user, its principle of work is: current impact impeller from the water inlet of water meter, and wheel rotation also passes to counter, by the water consumption of counter records water user.
Chinese patent literature CN2872026Y discloses a kind of front valve of multifunctional magnetic-controlled meter, magnetic principles is adopted to realize antidrip and check function, when showing rear leading water clock, utilize the differential water pressures that piston two ends are formed, piston is washed open by current instantaneously, one larger current enter water meter measurement, play the effect of water clock metering.But there is following problem in this technical scheme: 1, valve adopts piston seal, very high to requirement on machining accuracy, otherwise has minor leakage; 2, piston seal also may be blocked by dregs, and cause valve closing not tight, tiny current by valve, thus lose drip-proof effect; 3, valve internal is equipped with magnet steel, can be attracted on magnet steel in fluid if any magnetic conduction thing, reduces the reliability of valve.
China Patent No. ZL200520030632.9 discloses a kind of dripping water meter, the bottom of this water meter housing is intake antrum, top is measurement chamber, intake antrum and measurement chamber are equipped with water delivering orifice, measurement chamber water delivering orifice body is arranged to internal and external casing sandwich construction, inner sleeve is communicated with measurement chamber, afterbody in interlayer is provided with a circle elastic diaphragm, elastic diaphragm inner ring becomes a sealing to drip reservoir, this reservoir that drips is communicated with the intake antrum of table body, slide in inner sleeve and be provided with a valve plate, inner sleeve inside valve plate is fixed with in one the funneling elasticity faucet expanding external contracting, the opening's edge caliber size of faucet is less than the size of valve plate and opening's edge and valve plate seal to open and close and coordinate, the outside of valve plate is provided with a biasing springs, inner sleeve tube wall outside valve plate is provided with apopore, the position of apopore is in the scope of valve plate front-and-back opening-closing movement.
The principle of this patent is: be separated out water storage storehouse by barrier film, when dripping, first discharging water from water storage storehouse, after water storage Cang Shui discharges, opening passage, and metering once, stores up full water storage storehouse again, water meter intermittent dosing when realizing dripping.After membrane ruptures, can not drip metering.
Although this patent has good drip metering effect, but be communicated with reservoir because it is provided with a water inlet at intake antrum, this structure is when elastic diaphragm breaks, the water of intake antrum can directly by the reservoir that drips, and directly flow out water meter water delivering orifice without water meter movement metering, its result caused not only does not have the object of drip metering, and normal water flow measurement is also inaccurate.
Existing domestic water meter mainly rotor water gauge, the frictional resistance that the water meter of this structure is certain because rotor blade exists, when current are tiny flow quantity, water flow impact pressure is too small, just cannot promote rotor blade to rotate, indicating mechanism also just cannot be driven to indicate flow.When general water flow is below 10 ls/h, just cannot measure.For this reason, the water meter that can measure tiny flow quantity is devised, the patent No. is that the utility model patent of ZL02241975.6 discloses a kind of water meter, the heavy iron that one has tapering set up by this water meter below metering mechanism, the interior of the corresponding position of watchcase is made through shrinking, the tapering of itself and heavy iron to be matched, arrange in one in the central authorities of heavy iron simultaneously and flow valve, and be provided with centre pipe in the central authorities of middle stream valve, and be directly communicated with metering mechanism with the flat pattern conduit in heavy iron; When current are large, heavy iron is by jack-up, and current flow through from the major path around heavy iron, enter metering mechanism and count; When current are small, due to the deadweight of heavy iron, itself and watchcase are directly formed closed, and current flow the centre pipe of valve and through directly entering metering mechanism to the flat pattern conduit of straight heavy iron with it, realize counting from heavy iron central authorities.This patent is the principle adopting ball float, and when dripping, spool sinks, and blocks water inlet, promotes wheel rotation, realize metering from the water inlet of sidewall mouth; When large discharge, spool floats, and blocks sidewall mouth, from water inlet water inlet, promotes wheel rotation, realizes metering.But once there be impurity to enter, can stop that spool sinks, thus lose the effect of drip metering.
The patent No. is that the patented claim of 200610155151.X is by blocking the method for water inlet thus making current pass from hollow part the effect that the method promoting wheel rotation reaches drip metering with two pieces of magnet attractions, after but the time grown, magnet can make magnetic force decline because of the irony impurity in planar water, that is, after time length, this kind of drip metering table will lose the effect of drip metering.
Utility model content
The utility model proposes one to drip measurement mechanism, utilize the difference of water inlet temperature in environment temperature and water meter to draw drip metering, water flow measurement inaccurate problem when solving low flow velocity in prior art.
The technical solution of the utility model is achieved in that
One is dripped measurement mechanism, comprising: the first temperature sensor and the second temperature sensor; In certain room temperature environment (temperature 2 DEG C ~ 40 DEG C), when reaching elementary heat equilibrium state, in environment temperature and water meter, water inlet temperature has temperature difference, if at this moment allow water swivel drip (such as 3L/h) according to certain speed, temperature difference when so temperature reaches balance can change.If this temperature approach increases, illustrate that speed of dropping water is larger.Therefore, with the changing value of the hydrostatic temperature after balance with the flowing water temperature of dripping, and environment temperature reference point just accurately can judge dripping phenomenon.
First temperature sensor is arranged on has separation layer with environment and on the circuit board sealed, to ensure that sensor does not affect by distinguished and admirable, second temperature sensor is arranged on inside water meter inlet segment to water exit end, first temperature sensor output signal and the second temperature sensor output signal carry out subtraction, the voltage difference obtained is corresponding with flow rate of water flow, and the timing signal of timer is multiplied with described voltage difference and draws drip metering value.
Alternatively, described first temperature sensor is arrange the first thermo-sensitive resistor on circuit boards, described second temperature sensor is the second thermo-sensitive resistor be arranged on inside water meter inlet segment, also comprise constant current source, for described first thermo-sensitive resistor and the second thermo-sensitive resistor provide steady current, voltage difference and the flow rate of water flow of the first thermo-sensitive resistor and the second thermo-sensitive resistor are corresponding.
Alternatively, described first thermo-sensitive resistor two ends are also parallel with the first capacitor, and the second thermo-sensitive resistor two ends are also parallel with the second capacitor.
Alternatively, the measurement mechanism that drips of the present utility model, also comprise time capacitor and single-chip microcomputer, the output voltage of described first thermo-sensitive resistor and the output voltage timesharing of described second thermo-sensitive resistor are charged to described time capacitor, the output voltage of time capacitor and reference voltage are compared with comparer, comparator output terminal exports low and high level pulse, the resistance of pulsewidths representative thermo-sensitive resistor; Described pulse signal sends into single-chip microcomputer, and single-chip microcomputer timer internal recording impulse high level time, matches with the resistance value table prestored, obtain corresponding resistance value; The resistance value of single-chip microcomputer internal arithmetic logic to the first thermo-sensitive resistor and the second thermo-sensitive resistor is carried out subtraction and is obtained resistance difference, resistance difference and voltage difference proportional, and then obtain flow rate of water flow.
Alternatively, the measurement mechanism that drips of the present utility model, also comprise upper limit threshold resistance and lower threshold resistance, described constant current source provides steady current for described upper limit threshold resistance and lower threshold resistance, the output voltage of upper limit threshold resistance or lower threshold resistance charges to time capacitor, the higher limit of upper limit threshold resistance and the corresponding described resistance value table of lower threshold resistance difference and lower limit.
Alternatively, described first thermo-sensitive resistor, the second thermo-sensitive resistor, upper limit threshold resistance and lower threshold resistance select a switch to be connected with described time capacitor by four.
Alternatively, described first thermo-sensitive resistor, the second thermo-sensitive resistor, upper limit threshold resistance and lower threshold resistance select a switch to be connected with described constant current source by four.
Alternatively, described two covers four select a switch to be CD4052 chip.
Alternatively, the above-mentioned measurement mechanism that drips, described first thermo-sensitive resistor and the second thermo-sensitive resistor are PT1000 encapsulation.
The beneficial effects of the utility model are:
(1) combine with existing vane water meter, with the changing value of the hydrostatic temperature after balance with the flowing water temperature of dripping, and environment temperature reference point just accurately can judge dripping phenomenon, and the size of dripping is directly proportional to the absolute value of temperature gap, measures accurately during low flow velocity;
(2) when difference arrives greatly a certain value, water meter turbine rotates, and the measurement mechanism that drips can stop drip metering, owing to adopting vane water meter metering during large flow velocity, long service life.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is that the utility model drips the control circui block diagram of measurement mechanism;
Fig. 2 is that the utility model drips the circuit diagram of embodiment one of measurement mechanism;
Fig. 3 is that the utility model drips the circuit diagram of embodiment two of measurement mechanism;
Fig. 4 is that the utility model drips the circuit diagram of embodiment three of measurement mechanism;
Fig. 5 is that the utility model drips the circuit diagram of embodiment four of measurement mechanism.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
In certain room temperature environment (temperature 2 DEG C ~ 40 DEG C), when reaching elementary heat equilibrium state, in environment temperature and water meter, water inlet temperature has temperature difference, if at this moment allow water swivel drip (such as 3L/h) according to certain speed, temperature difference when so temperature reaches balance can change.If this temperature approach increases, illustrate that speed of dropping water is larger.Therefore, with the changing value of the hydrostatic temperature after balance with the flowing water temperature of dripping, and environment temperature reference point just accurately can judge dripping phenomenon.And the size of dripping is directly proportional to the absolute value of temperature gap, when difference arrives greatly a certain value, wheel rotation, can adopt traditional water meter to measure.
As shown in Figure 1, one of the present utility model is dripped measurement mechanism, comprising: the first temperature sensor and the second temperature sensor; First temperature sensor is arranged on has separation layer with environment and on the circuit board sealed, to ensure that sensor does not affect by distinguished and admirable; Second temperature sensor is arranged on inside water meter inlet segment to water exit end, first temperature sensor output signal and the second temperature sensor output signal carry out subtraction by subtraction circuit, the voltage difference obtained is corresponding with flow rate of water flow, and the timing signal of timer is multiplied with described voltage difference and draws drip metering value.Above-mentioned arithmetic logic can be realized by the totalizer in existing single-chip microcomputer, multiplier and timer.Preferably, the second temperature sensor is sealed by stainless-steel tube, long service life.
The measurement mechanism that drips of the present utility model combines with existing vane water meter, with the changing value of the hydrostatic temperature after balance with the flowing water temperature of dripping, and environment temperature reference point just accurately can judge dripping phenomenon, and the size of dripping is directly proportional to the absolute value of temperature gap, when difference arrives greatly a certain value, water meter turbine rotates, and the measurement mechanism that drips can stop drip metering.
Below in conjunction with specific embodiment, the measurement mechanism that drips of the present utility model is described in detail.
Embodiment one
As shown in Figure 2, first temperature sensor is arrange the first thermo-sensitive resistor R1 on circuit boards, second temperature sensor is the second thermo-sensitive resistor R2 be arranged on inside water meter inlet segment, also comprises constant current source Is, for the first thermo-sensitive resistor R1 and the second thermo-sensitive resistor R2 provides steady current.As mentioned above, the size of dripping is directly proportional to the absolute value of temperature gap, for the present embodiment, the resistance of thermo-sensitive resistor and temperature line relationship, the resistance that temperature gap corresponds to the first thermo-sensitive resistor and the second thermo-sensitive resistor is poor, under the constant current effect of constant current source Is, correspond to voltage difference simultaneously.Preferably, the first thermo-sensitive resistor two ends are also parallel with the first capacitor C1, and the second thermo-sensitive resistor two ends are also parallel with the second capacitor C2.
For rc charging circuit, duration of charging and the resistance value of capacitor are proportional, therefore, the measurements and calculations of resistance are converted to the calculating to the duration of charging by the present embodiment, simplify circuit structure, as shown in Figure 2, the measurement mechanism that drips also comprises time capacitor C3 and single-chip microcomputer, the output voltage of the first thermo-sensitive resistor R1 and the output voltage of the second thermo-sensitive resistor R2 are charged to time capacitor C3 by either-or switch K1 timesharing, the output voltage of time capacitor C3 and reference voltage are compared with comparer A, comparator output terminal exports low and high level pulse, the resistance of pulsewidths representative thermo-sensitive resistor.The pulse signal that comparer A exports sends into single-chip microcomputer, and in the present embodiment, single-chip microcomputer is not limited to chivalrous single-chip microcomputer, also comprises the digital signal processors such as DSP or ARM.
Single-chip microcomputer timer internal recording impulse high level time, high level time represents the resistance value size of thermo-sensitive resistor, and the resistance value table then prestored with storer matches, and obtains corresponding resistance value; The resistance value of single-chip microcomputer internal arithmetic logic to the first thermo-sensitive resistor and the second thermo-sensitive resistor is carried out subtraction and is obtained resistance difference, resistance difference and voltage difference proportional, and then obtain flow rate of water flow.Timer is multiplied with flow rate of water flow and obtains out drip metering, and timer can adopt external timer, also can adopt single-chip microcomputer internal timer.
Above-mentioned single-chip microcomputer timer internal, arithmetic logic and storer arrange and all adopt existing set-up mode, and the precision of resistance table is determined by the figure place of single-chip microcomputer self, and the setting of single-chip microcomputer does not relate to improvements over the prior art.
Embodiment two
For resistance, different environment temperatures can bring temperature drift in various degree, and resistance value table is prestored in the storer of single-chip microcomputer, the error brought is floated in order to solve resistance value temperature, as shown in Figure 3, the present embodiment drip measurement mechanism on the basis of embodiment one, also comprise upper limit threshold resistance R3 and lower threshold resistance R4, constant current source Is provides steady current for upper limit threshold resistance R3 and lower threshold resistance R4, and the output voltage of upper limit threshold resistance R3 or lower threshold resistance R4 charges to time capacitor C3 respectively.The higher limit of the corresponding described resistance value table of upper limit threshold resistance R3 and lower threshold resistance R4 difference and lower limit are also higher limit and the lower limit of corresponding thermo-sensitive resistor.Because upper limit threshold resistance R3, lower threshold resistance R4, the first thermo-sensitive resistor R1 float identical with the temperature of the second thermo-sensitive resistor R 2, therefore, float by resistance temperature can be solved to the sampling of upper limit threshold resistance R3 and lower threshold resistance R4 the error in dipping brought.
Preferably, above-mentioned first thermo-sensitive resistor R1, the second thermo-sensitive resistor R2, upper limit threshold resistance R3 select a K switch 2 to be connected with time capacitor C3 with lower threshold resistance R4 by four, and timesharing is charged to time capacitor C3, are also timesharing survey calculation resistance.
Embodiment three
As shown in Figure 4, the present embodiment is on the basis of embodiment two, first thermo-sensitive resistor R1, the second thermo-sensitive resistor R2, upper limit threshold resistance R3 and lower threshold resistance R 4 select a K switch 3 to be connected in parallel with described constant current source Is by four, further simplify circuit structure.
Embodiment four
As shown in Figure 5, the present embodiment is on the basis of embodiment three, and above-mentioned two covers four select a switch to be CD4052 chip.Circuit structure is simplified further by integrated circuit (IC) chip.
Preferably, in each embodiment above-mentioned, the first thermo-sensitive resistor R1 and the second thermo-sensitive resistor R2 is the encapsulation of PT1000 paster.Above-mentioned each component parameters can with reference to following design: upper limit threshold resistance R3=1.4K Ω, lower threshold resistance R4=1K Ω, the first capacitor C1 and the second capacitor C2 is 0.1 μ F.
The measurement mechanism that drips of the present utility model combines with existing vane water meter, with the changing value of the hydrostatic temperature after balance with the flowing water temperature of dripping, and environment temperature reference point just accurately can judge dripping phenomenon, and the size of dripping is directly proportional to the absolute value of temperature gap, when difference arrives greatly a certain value, water meter turbine rotates, the measurement mechanism that drips can stop drip metering, measure accurately during low flow velocity, and owing to adopting vane water meter metering during large flow velocity, long service life.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (9)
1. drip a measurement mechanism, it is characterized in that, comprising: the first temperature sensor and the second temperature sensor; First temperature sensor is arranged on airtight circuit board, second temperature sensor is arranged on inside water meter inlet segment to water exit end, first temperature sensor output signal and the second temperature sensor output signal carry out subtraction, the voltage difference obtained is corresponding with flow rate of water flow, and the timing signal of timer is multiplied with described voltage difference and draws drip metering value.
2. drip measurement mechanism as claimed in claim 1, it is characterized in that, described first temperature sensor is arrange the first thermo-sensitive resistor on circuit boards, described second temperature sensor is the second thermo-sensitive resistor be arranged on inside water meter inlet segment, also comprise constant current source, for described first thermo-sensitive resistor and the second thermo-sensitive resistor provide steady current, voltage difference and the flow rate of water flow of the first thermo-sensitive resistor and the second thermo-sensitive resistor are corresponding.
3. drip measurement mechanism as claimed in claim 2, it is characterized in that, described first thermo-sensitive resistor two ends are also parallel with the first capacitor, and the second thermo-sensitive resistor two ends are also parallel with the second capacitor.
4. drip measurement mechanism as claimed in claim 2, it is characterized in that, also comprise time capacitor and single-chip microcomputer, the output voltage of described first thermo-sensitive resistor and the output voltage timesharing of described second thermo-sensitive resistor are charged to described time capacitor, the output voltage of time capacitor and reference voltage are compared with comparer, comparator output terminal exports low and high level pulse, the resistance of pulsewidths representative thermo-sensitive resistor; Described pulse signal sends into single-chip microcomputer, and single-chip microcomputer timer internal recording impulse high level time, matches with the resistance value table prestored, obtain corresponding resistance value; The resistance value of single-chip microcomputer internal arithmetic logic to the first thermo-sensitive resistor and the second thermo-sensitive resistor is carried out subtraction and is obtained resistance difference, resistance difference and voltage difference proportional, and then obtain flow rate of water flow.
5. drip measurement mechanism as claimed in claim 4, it is characterized in that, also comprise upper limit threshold resistance and lower threshold resistance, described constant current source provides steady current for described upper limit threshold resistance and lower threshold resistance, the output voltage of upper limit threshold resistance or lower threshold resistance charges to time capacitor, the higher limit of upper limit threshold resistance and the corresponding described resistance value table of lower threshold resistance difference and lower limit.
6. drip measurement mechanism as claimed in claim 5, it is characterized in that, described first thermo-sensitive resistor, the second thermo-sensitive resistor, upper limit threshold resistance select a switch to be connected with described time capacitor with lower threshold resistance by four.
7. drip measurement mechanism as claimed in claim 6, it is characterized in that, described first thermo-sensitive resistor, the second thermo-sensitive resistor, upper limit threshold resistance select a switch to be connected with described constant current source with lower threshold resistance by four.
8. drip measurement mechanism as claimed in claim 7, it is characterized in that, described two covers four select a switch to be CD4052 chip.
9. the measurement mechanism that drips as described in claim 2 to 8 any one, is characterized in that, described first thermo-sensitive resistor and the second thermo-sensitive resistor are PT1000 encapsulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520077936.4U CN204421987U (en) | 2015-02-04 | 2015-02-04 | One is dripped measurement mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520077936.4U CN204421987U (en) | 2015-02-04 | 2015-02-04 | One is dripped measurement mechanism |
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| CN204421987U true CN204421987U (en) | 2015-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520077936.4U Expired - Fee Related CN204421987U (en) | 2015-02-04 | 2015-02-04 | One is dripped measurement mechanism |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104596590A (en) * | 2015-02-04 | 2015-05-06 | 青岛海威茨仪表有限公司 | Drip measuring device and drip measuring method |
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2015
- 2015-02-04 CN CN201520077936.4U patent/CN204421987U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104596590A (en) * | 2015-02-04 | 2015-05-06 | 青岛海威茨仪表有限公司 | Drip measuring device and drip measuring method |
| CN104596590B (en) * | 2015-02-04 | 2017-08-04 | 青岛海威茨仪表有限公司 | One kind is dripped measurement apparatus and measuring method |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150624 |
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| CF01 | Termination of patent right due to non-payment of annual fee |